package wordy

import (
	"strconv"
	"strings"
)

// Answer parses a simple word problem and returns the result
// or false if it wasn't valid
func Answer(inp string) (int, bool) {
	var ret int
	var operation string
	var didOperation bool
	words := strings.Fields(inp)
	for i := range words {
		tstWord := strings.Replace(words[i], "?", "", -1)
		if v, err := strconv.Atoi(tstWord); err == nil {
			switch operation {
			case "":
				ret = v
			case "plus":
				ret += v
				didOperation = true
			case "minus":
				ret -= v
				didOperation = true
			case "multiplied":
				ret *= v
				didOperation = true
			case "divided":
				ret /= v
				didOperation = true
			}
		} else {
			if words[i] == "plus" || words[i] == "minus" || words[i] == "multiplied" || words[i] == "divided" {
				operation = words[i]
			}
		}
	}
	return ret, didOperation
}